Move modals and rename classes to match file names (#1367)

## Launch Checklist

I've created a folder for modals and moved them all inside.
I removed the icons which were small files with no real benefit and
moved the icons to where they were used.
I fixed an issue with the close button position in modal.
I've added missing translation to "Links" in debug modal.

Before: 

<img width="610" height="81" alt="image"
src="https://github.com/user-attachments/assets/dd7520f6-9634-4ff1-a83d-99ceae7c9144"
/>

After:
<img width="610" height="81" alt="image"
src="https://github.com/user-attachments/assets/fe3a2ccf-6c09-42ab-bf6f-dd30d3c68e13"
/>


 - [x] Briefly describe the changes in this PR.
- [x] Include before/after visuals or gifs if this PR includes visual
changes.
 - [ ] Add an entry to `CHANGELOG.md` under the `## main` section.

src/components/LayerList.tsx

@@ -16,7 +16,7 @@ import {
 
 import LayerListGroup from './LayerListGroup'
 import LayerListItem from './LayerListItem'
-import ModalAdd from './ModalAdd'
+import ModalAdd from './modals/ModalAdd'
 
 import type {LayerSpecification, SourceSpecification} from 'maplibre-gl';
 import generateUniqueId from '../libs/document-uid';